*From error log 5* You are running into "out off memory" So KSP is trying to go past the max memory a 32bit program can use *around 3.5-3.7Gb RAM* Install this memory monitor mod http://forum.kerbalspaceprogram.com/threads/92907 *or find it on CKAN as "Graphic Memory Monitor"* to keep a eye on your memory.

There is no official 64bit of KSP right now, they tried before on a older build of Unity3d and it didn't really work, but there is a unofficial 64bit workaround here http://forum.kerbalspaceprogram.com/threads/117224-Windows-64-bit-community-workaround but by going this way there is no support if game crash.

Steam is using a program id number system that pulls the needed info on where it has installed the game/program from the registry. But then KSP don't need to know where it's installed, it know that where the KSP.exe is the root dir. and look after "GameData" and "KSP_Data" beside the KSP.exe.

And 64bit is not official supported so best to use this post http://forum.kerbalspaceprogram.com/threads/117224-Windows-64-bit-community-workaround or http://forum.kerbalspaceprogram.com/threads/113069-WIN-1-0-X-KSP-x64-Total-Unfixer-v2-2-04-08-2015 to get support. This support forum is only for 32bit windows and linux 32bit/64bit(?)

@ArkaelDren - No matter what then we (mod-user) don't have any right to demand what mod-maker do to there mods. And so long Unity(Squad) can't make a stable(official) 64bit version, we can't demand mod-makers to make there mods work in 64bit.

@Youen But the thing is that MM is working on 64bit, only showing the "rainbow" cat as a warning that you run 64bit. And from my knowledge serbian don't support 64bit yet he's not blocking he's mods from running, just warning about it. So really no need to unfix MM. And I like to see the "rainbow" cat, knowing that it is my 64bit KSP I was running.